{"id":930,"date":"2004-11-15T13:33:00","date_gmt":"2004-11-15T12:33:00","guid":{"rendered":"https:\/\/kids.esa.int\/in_the_beginning\/"},"modified":"2026-10-08T00:33:53","modified_gmt":"2026-10-07T22:33:53","slug":"in_the_beginning","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/in_the_beginning\/","title":{"rendered":"Alussa"},"content":{"rendered":"
\n

El\u00e4v\u00e4t olennot hengitt\u00e4v\u00e4t, sy\u00f6v\u00e4t, kasvavat ja j\u00e4tt\u00e4v\u00e4t j\u00e4lkel\u00e4isi\u00e4. Niit\u00e4 on kaikkea yksinkertaisimmista yksisoluista bakteereista kasveihin, lintuihin, el\u00e4imiin ja ihmisiin. Maa on ainoa tuntemamme maailma, jossa el\u00e4m\u00e4 on mahdollista. Kukaan ei tied\u00e4, miten el\u00e4m\u00e4 sai alkunsa. Siihen n\u00e4ytt\u00e4\u00e4 liittyv\u00e4n tiettyjen kemikaalien yhdistyminen. Mutta se, mik\u00e4 muuttaa n\u00e4m\u00e4 kemikaalit el\u00e4m\u00e4nmuodoiksi, on mysteeri.<\/p>\n<\/div>\n

Muinaisten kivien tutkimukset ovat osoittaneet, ett\u00e4 el\u00e4m\u00e4 alkoi maapallolla noin 3 800 miljoonaa vuotta sitten. Tuolloin maapallo oli eritt\u00e4in elinkelvoton paikka. Ilma oli paksua ja myrkyllist\u00e4. Komeetat ja meteoriitit satoivat planeetalle.<\/p>\n

Nuori Maa oli vesimaailma, jossa oli vain pieni\u00e4 kuivia maa-alueita. Monet tutkijat uskovat, ett\u00e4 el\u00e4m\u00e4 sai alkunsa j\u00e4rviss\u00e4 ja meriss\u00e4. Monet el\u00e4m\u00e4n syntyyn tarvittavista aineosista ovat saattaneet saapua komeettojen ja meteoriittien mukana.<\/p>\n

\"Did
Alkoiko el\u00e4m\u00e4 meriss\u00e4?<\/figcaption><\/figure>\n

Alkoiko el\u00e4m\u00e4 meriss\u00e4?<\/p>\n

Auringon salamat ja ultraviolettis\u00e4teily ovat saattaneet hajottaa ilmakeh\u00e4n vetypitoiset kaasut. Energiaa on saattanut tulla my\u00f6s merenpohjassa sijaitsevista kuumista l\u00e4hteist\u00e4, joita kutsutaan \u2018mustiksi savuttajiksi\u2019. Ajan my\u00f6t\u00e4 yksinkertaiset kemikaalit yhdistyiv\u00e4t suuremmiksi ja monimutkaisemmiksi kemikaaleiksi.<\/p>\n

Kun n\u00e4m\u00e4 kemikaalit olivat kertyneet meriin tai j\u00e4rviin, ne muodostivat \u2018orgaanisen keiton\u2019. Er\u00e4\u00e4n\u00e4 p\u00e4iv\u00e4n\u00e4 sattui onnettomuus. Yksi molekyyli alkoi tehd\u00e4 itsest\u00e4\u00e4n kopioita. Maapallolle oli syntynyt el\u00e4m\u00e4.<\/p>","protected":false},"excerpt":{"rendered":"

Living things breathe, feed, grow and leave offspring. They range from the simplest single-celled bacteria to plants, birds, animals and humans. Earth is the only world we know that supports […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2003\/04\/old_picture_shows_a_meteor_shower_on_13_november_18332\/18247733-2-eng-GB\/Old_picture_shows_a_meteor_shower_on_13_November_1833.jpg","esa_banner_description":"Old picture shows a meteor shower on 13 November 1833","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/04\/Old_picture_shows_a_meteor_shower_on_13_November_18332","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[10,11,19],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-930","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-story-of-the-universe","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/930","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/comments?post=930"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/930\/revisions"}],"predecessor-version":[{"id":4744,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/930\/revisions\/4744"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=930"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=930"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=930"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=930"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=930"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=930"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=930"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=930"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=930"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=930"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}